Abstract
AbstractA number of (E)‐7‐arylidenenaltrexones were synthesized by azeotropic distillation of water from a benzene solution of naltrexone and an aromatic aldehyde (benzaldehyde, 4‐chloro‐ and 4‐fluorobenzaldehyde, 3‐and 4‐pyridinecarboxaldehyde and 1‐methyl‐2‐imidazolecarboxaldehyde) using piperidine as a catalyst. In addition, (E)‐7‐benzylidenenaloxone was prepared by the previously published Claisen‐Schmidt condensation using sodium hydroxide in methanol. The stereochemistry of these arylidene derivatives 3–9 was determined to be (E) by means of nuclear Overhauser enhancement experiments. The 13C nmr spectra of (E)‐3–9 are recorded in deuteriochloroform and those of the hydrochlorides in deuteriodimethyl sulfoxide.
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